* {
  margin: 0;
  padding: 0;
}
*,
:after,
:before {
  box-sizing: border-box;
}
#html {
  word-break: break-all;
}
#div1 {
  position: fixed;
  left: 50%;
  transform: translateX(-50%);
  top: 30px;
}
#div1::before,
#div1::after {
  content: "";
  position: absolute;
  display: block;
}
@media (max-width: 500px) {
  #html {
    overflow: auto;
  }
  #div1Wrapper,
  #html {
    height: 50vh;
  }
  #div1 {
    position: relative;
  }
}
